After the game, Wenger told Sky Sports News that he thought the result was never in any doubt.
He said: "It was very quick and we took advantage maybe of their disappointment from the first goal that happened.
"I think we were always in control, even before we scored. It was just to find the opening and have the patience not to give the ball away.
"In the second half it was game over and there was more control of the game."
The result has lifted Arsenal up to fourth in the Premier League table.